<!DOCTYPE html>
<html>
<head>
<title>04第3章 实训练习.md</title>
<meta http-equiv="Content-type" content="text/html;charset=UTF-8">

<style>
/* https://github.com/microsoft/vscode/blob/master/extensions/markdown-language-features/media/markdown.css */
/*---------------------------------------------------------------------------------------------
 *  Copyright (c) Microsoft Corporation. All rights reserved.
 *  Licensed under the MIT License. See License.txt in the project root for license information.
 *--------------------------------------------------------------------------------------------*/

body {
	font-family: var(--vscode-markdown-font-family, -apple-system, BlinkMacSystemFont, "Segoe WPC", "Segoe UI", "Ubuntu", "Droid Sans", sans-serif);
	font-size: var(--vscode-markdown-font-size, 14px);
	padding: 0 26px;
	line-height: var(--vscode-markdown-line-height, 22px);
	word-wrap: break-word;
}

#code-csp-warning {
	position: fixed;
	top: 0;
	right: 0;
	color: white;
	margin: 16px;
	text-align: center;
	font-size: 12px;
	font-family: sans-serif;
	background-color:#444444;
	cursor: pointer;
	padding: 6px;
	box-shadow: 1px 1px 1px rgba(0,0,0,.25);
}

#code-csp-warning:hover {
	text-decoration: none;
	background-color:#007acc;
	box-shadow: 2px 2px 2px rgba(0,0,0,.25);
}

body.scrollBeyondLastLine {
	margin-bottom: calc(100vh - 22px);
}

body.showEditorSelection .code-line {
	position: relative;
}

body.showEditorSelection .code-active-line:before,
body.showEditorSelection .code-line:hover:before {
	content: "";
	display: block;
	position: absolute;
	top: 0;
	left: -12px;
	height: 100%;
}

body.showEditorSelection li.code-active-line:before,
body.showEditorSelection li.code-line:hover:before {
	left: -30px;
}

.vscode-light.showEditorSelection .code-active-line:before {
	border-left: 3px solid rgba(0, 0, 0, 0.15);
}

.vscode-light.showEditorSelection .code-line:hover:before {
	border-left: 3px solid rgba(0, 0, 0, 0.40);
}

.vscode-light.showEditorSelection .code-line .code-line:hover:before {
	border-left: none;
}

.vscode-dark.showEditorSelection .code-active-line:before {
	border-left: 3px solid rgba(255, 255, 255, 0.4);
}

.vscode-dark.showEditorSelection .code-line:hover:before {
	border-left: 3px solid rgba(255, 255, 255, 0.60);
}

.vscode-dark.showEditorSelection .code-line .code-line:hover:before {
	border-left: none;
}

.vscode-high-contrast.showEditorSelection .code-active-line:before {
	border-left: 3px solid rgba(255, 160, 0, 0.7);
}

.vscode-high-contrast.showEditorSelection .code-line:hover:before {
	border-left: 3px solid rgba(255, 160, 0, 1);
}

.vscode-high-contrast.showEditorSelection .code-line .code-line:hover:before {
	border-left: none;
}

img {
	max-width: 100%;
	max-height: 100%;
}

a {
	text-decoration: none;
}

a:hover {
	text-decoration: underline;
}

a:focus,
input:focus,
select:focus,
textarea:focus {
	outline: 1px solid -webkit-focus-ring-color;
	outline-offset: -1px;
}

hr {
	border: 0;
	height: 2px;
	border-bottom: 2px solid;
}

h1 {
	padding-bottom: 0.3em;
	line-height: 1.2;
	border-bottom-width: 1px;
	border-bottom-style: solid;
}

h1, h2, h3 {
	font-weight: normal;
}

table {
	border-collapse: collapse;
}

table > thead > tr > th {
	text-align: left;
	border-bottom: 1px solid;
}

table > thead > tr > th,
table > thead > tr > td,
table > tbody > tr > th,
table > tbody > tr > td {
	padding: 5px 10px;
}

table > tbody > tr + tr > td {
	border-top: 1px solid;
}

blockquote {
	margin: 0 7px 0 5px;
	padding: 0 16px 0 10px;
	border-left-width: 5px;
	border-left-style: solid;
}

code {
	font-family: Menlo, Monaco, Consolas, "Droid Sans Mono", "Courier New", monospace, "Droid Sans Fallback";
	font-size: 1em;
	line-height: 1.357em;
}

body.wordWrap pre {
	white-space: pre-wrap;
}

pre:not(.hljs),
pre.hljs code > div {
	padding: 16px;
	border-radius: 3px;
	overflow: auto;
}

pre code {
	color: var(--vscode-editor-foreground);
	tab-size: 4;
}

/** Theming */

.vscode-light pre {
	background-color: rgba(220, 220, 220, 0.4);
}

.vscode-dark pre {
	background-color: rgba(10, 10, 10, 0.4);
}

.vscode-high-contrast pre {
	background-color: rgb(0, 0, 0);
}

.vscode-high-contrast h1 {
	border-color: rgb(0, 0, 0);
}

.vscode-light table > thead > tr > th {
	border-color: rgba(0, 0, 0, 0.69);
}

.vscode-dark table > thead > tr > th {
	border-color: rgba(255, 255, 255, 0.69);
}

.vscode-light h1,
.vscode-light hr,
.vscode-light table > tbody > tr + tr > td {
	border-color: rgba(0, 0, 0, 0.18);
}

.vscode-dark h1,
.vscode-dark hr,
.vscode-dark table > tbody > tr + tr > td {
	border-color: rgba(255, 255, 255, 0.18);
}

</style>

<style>
/* Tomorrow Theme */
/* http://jmblog.github.com/color-themes-for-google-code-highlightjs */
/* Original theme - https://github.com/chriskempson/tomorrow-theme */

/* Tomorrow Comment */
.hljs-comment,
.hljs-quote {
	color: #8e908c;
}

/* Tomorrow Red */
.hljs-variable,
.hljs-template-variable,
.hljs-tag,
.hljs-name,
.hljs-selector-id,
.hljs-selector-class,
.hljs-regexp,
.hljs-deletion {
	color: #c82829;
}

/* Tomorrow Orange */
.hljs-number,
.hljs-built_in,
.hljs-builtin-name,
.hljs-literal,
.hljs-type,
.hljs-params,
.hljs-meta,
.hljs-link {
	color: #f5871f;
}

/* Tomorrow Yellow */
.hljs-attribute {
	color: #eab700;
}

/* Tomorrow Green */
.hljs-string,
.hljs-symbol,
.hljs-bullet,
.hljs-addition {
	color: #718c00;
}

/* Tomorrow Blue */
.hljs-title,
.hljs-section {
	color: #4271ae;
}

/* Tomorrow Purple */
.hljs-keyword,
.hljs-selector-tag {
	color: #8959a8;
}

.hljs {
	display: block;
	overflow-x: auto;
	color: #4d4d4c;
	padding: 0.5em;
}

.hljs-emphasis {
	font-style: italic;
}

.hljs-strong {
	font-weight: bold;
}
</style>

<style>
/*
 * Markdown PDF CSS
 */

 body {
	font-family: -apple-system, BlinkMacSystemFont, "Segoe WPC", "Segoe UI", "Ubuntu", "Droid Sans", sans-serif, "Meiryo";
	padding: 0 12px;
}

pre {
	background-color: #f8f8f8;
	border: 1px solid #cccccc;
	border-radius: 3px;
	overflow-x: auto;
	white-space: pre-wrap;
	overflow-wrap: break-word;
}

pre:not(.hljs) {
	padding: 23px;
	line-height: 19px;
}

blockquote {
	background: rgba(127, 127, 127, 0.1);
	border-color: rgba(0, 122, 204, 0.5);
}

.emoji {
	height: 1.4em;
}

code {
	font-size: 14px;
	line-height: 19px;
}

/* for inline code */
:not(pre):not(.hljs) > code {
	color: #C9AE75; /* Change the old color so it seems less like an error */
	font-size: inherit;
}

/* Page Break : use <div class="page"/> to insert page break
-------------------------------------------------------- */
.page {
	page-break-after: always;
}

</style>

<script src="https://unpkg.com/mermaid/dist/mermaid.min.js"></script>
</head>
<body>
  <script>
    mermaid.initialize({
      startOnLoad: true,
      theme: document.body.classList.contains('vscode-dark') || document.body.classList.contains('vscode-high-contrast')
          ? 'dark'
          : 'default'
    });
  </script>
<h1 id="03%E7%AC%AC3%E7%AB%A0-%E5%AE%9E%E8%AE%AD%E7%BB%83%E4%B9%A0">03第3章 实训练习</h1>
<h2 id="%E5%AE%9E%E8%AE%AD%E7%9B%AE%E7%9A%84">实训目的</h2>
<ol>
<li>熟悉回调函数的使用；</li>
<li>熟悉包管理工具npm的使用；</li>
<li>熟悉版本管理工具git。</li>
</ol>
<h2 id="%E5%AE%9E%E8%AE%AD%E5%86%85%E5%AE%B9">实训内容</h2>
<ol>
<li>
<p>熟悉回调函数的使用1。 在终端每秒输出一次“Hello world!”，5秒后停止。</p>
</li>
<li>
<p>给定一个 <em>k</em> 位大于0的整数，请编写程序统计每种不同的个位数字出现的次数。例如：给定 <em>N</em>=100311，则有 2 个 0，3 个 1，和 1 个 3。 (团体程序设计天梯赛-练习集，L1-003 个位数统计)</p>
<p><strong>输入格式：</strong>
每个输入包含 1 个测试用例，即一个不超过 1000 位的正整数 N。</p>
<p><strong>输出格式：</strong>
对 N 中每一种不同的个位数字，以 D:M 的格式在一行中输出该位数字 D 及其在 N 中出现的次数 M。要求按 D 的升序输出。</p>
<p><strong>输入样例：</strong></p>
<pre class="hljs"><code><div>100311
</div></code></pre>
<p><strong>输出样例：</strong></p>
<pre class="hljs"><code><div>0:2
1:3
3:1
</div></code></pre>
<p><strong>部分代码：</strong></p>
<pre class="hljs"><code><div><span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">ttL003</span>(<span class="hljs-params"></span>) </span>{
    <span class="hljs-keyword">const</span> readline = <span class="hljs-built_in">require</span>(<span class="hljs-string">'readline'</span>);
    <span class="hljs-keyword">const</span> rl = readline.createInterface({
        <span class="hljs-attr">input</span>: process.stdin,
        <span class="hljs-attr">output</span>: process.stdout
    });
    rl.on(<span class="hljs-string">'line'</span>, <span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params">line</span>) </span>{<span class="hljs-comment">//监听line事件，即键盘输入事件，line参数就是键盘输入的数据行</span>
        <span class="hljs-comment">// 省略了一些行</span>






        rl.close();
    });
    rl.on(<span class="hljs-string">'close'</span>, () =&gt; {
        rl.close();
    });
}
ttL003();
</div></code></pre>
</li>
<li>
<p>配置cnpm工具，让npm下载包转向淘宝镜像。（参考：解决 npm 下载慢问题）</p>
</li>
<li>
<p>在码云上建立一个临时仓库，把第1题代码传至这个仓库。</p>
</li>
<li>
<p>使用”markdown“第三方包，这是制作”markdown“类文档的工具包。</p>
<ol>
<li>在“www.npmjs.com&quot;中查询”markdown“包，打开查找的结果页面；</li>
<li>在包页面上提示了在页面中使用这个包的方法，示例代码如下所示。</li>
</ol>
<pre class="hljs"><code><div><span class="hljs-meta">&lt;!DOCTYPE <span class="hljs-meta-keyword">html</span>&gt;</span>
<span class="hljs-tag">&lt;<span class="hljs-name">html</span>&gt;</span>
  <span class="hljs-tag">&lt;<span class="hljs-name">body</span>&gt;</span>
    <span class="hljs-tag">&lt;<span class="hljs-name">textarea</span> <span class="hljs-attr">id</span>=<span class="hljs-string">"text-input"</span> <span class="hljs-attr">oninput</span>=<span class="hljs-string">"this.editor.update()"</span>
              <span class="hljs-attr">rows</span>=<span class="hljs-string">"6"</span> <span class="hljs-attr">cols</span>=<span class="hljs-string">"60"</span>&gt;</span>Type **Markdown** here.<span class="hljs-tag">&lt;/<span class="hljs-name">textarea</span>&gt;</span>
    <span class="hljs-tag">&lt;<span class="hljs-name">div</span> <span class="hljs-attr">id</span>=<span class="hljs-string">"preview"</span>&gt;</span> <span class="hljs-tag">&lt;/<span class="hljs-name">div</span>&gt;</span>
    <span class="hljs-tag">&lt;<span class="hljs-name">script</span> <span class="hljs-attr">src</span>=<span class="hljs-string">"lib/markdown.js"</span>&gt;</span><span class="hljs-tag">&lt;/<span class="hljs-name">script</span>&gt;</span> 
    <span class="hljs-tag">&lt;<span class="hljs-name">script</span>&gt;</span><span class="javascript">
      <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">Editor</span>(<span class="hljs-params">input, preview</span>) </span>{
        <span class="hljs-keyword">this</span>.update = <span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params"></span>) </span>{
          preview.innerHTML = markdown.toHTML(input.value);
        };
        input.editor = <span class="hljs-keyword">this</span>;
        <span class="hljs-keyword">this</span>.update();
      }
      <span class="hljs-keyword">var</span> $ = <span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params">id</span>) </span>{ <span class="hljs-keyword">return</span> <span class="hljs-built_in">document</span>.getElementById(id); };
      <span class="hljs-keyword">new</span> Editor($(<span class="hljs-string">"text-input"</span>), $(<span class="hljs-string">"preview"</span>));
    </span><span class="hljs-tag">&lt;/<span class="hljs-name">script</span>&gt;</span> 
  <span class="hljs-tag">&lt;/<span class="hljs-name">body</span>&gt;</span>
<span class="hljs-tag">&lt;/<span class="hljs-name">html</span>&gt;</span>
</div></code></pre>
<ol start="3">
<li>新建页面，复制上述源代码，修改上述导入”markdown.js“的方法，浏览新建页面，体验”Markdown“工具。</li>
</ol>
</li>
</ol>

</body>
</html>
